Module Name: src
Committed By: uwe
Date: Mon Sep 11 12:00:45 UTC 2023
Modified Files:
src/lib/libarch/sparc/v8: sparc_v8.S
Log Message:
sparc_v8.S: fix v8 .mul/.umul versions to conform to psABI
Both .mul and .umul are defined to return the most significant 32 bits
of the result in %o1, but v8 multiplication instructions put them in
%y. Move them to %o1. Nothing in the gcc generated code depends on
this, but hand-written assembly can rely on this and e.g. Self does.
To generate a diff of this commit:
cvs rdiff -u -r1.2 -r1.3 src/lib/libarch/sparc/v8/sparc_v8.S
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/lib/libarch/sparc/v8/sparc_v8.S
diff -u src/lib/libarch/sparc/v8/sparc_v8.S:1.2 src/lib/libarch/sparc/v8/sparc_v8.S:1.3
--- src/lib/libarch/sparc/v8/sparc_v8.S:1.2 Tue Sep 22 13:27:13 2015
+++ src/lib/libarch/sparc/v8/sparc_v8.S Mon Sep 11 12:00:45 2023
@@ -6,28 +6,45 @@
.file "sparc_v8.S"
.section ".text"
-/*--- .umul ---*/
+
+/*
+ * unsigned .umul(unsigned a, unsigned b)
+ *
+ * This function computes a * b with unsigned integer
+ * multiplication. When .umul returns, the caller's register %o0
+ * contains the least significant 32 bits of the 64-bit result;
+ * register %o1 holds the most significant 32 bits of the result.
+ * Upon return, the integer condition codes and registers %o2
+ * through %o5 have unspecified values.
+ */
.align 4
.global .umul
.type .umul,@function
-
.umul:
- !#PROLOGUE# 0
- !#PROLOGUE# 1
+ umul %o0, %o1, %o0
retl
- umul %o0, %o1, %o0
+ rd %y, %o1
.LLfe1:
.size .umul,.LLfe1-.umul
-/*--- .mul ---*/
+
+/*
+ * int .mul(int a, int b)
+ *
+ * This function computes a * b with signed integer
+ * multiplication. When .mul returns, the caller's register %o0
+ * contains the least significant 32 bits of the 64-bit result;
+ * register %o1 holds the most significant 32 bits of the result.
+ * Upon return, the integer condition codes and registers %o2
+ * through %o5 have unspecified values.
+ */
.align 4
.global .mul
.type .mul,@function
.mul:
- !#PROLOGUE# 0
- !#PROLOGUE# 1
+ smul %o0, %o1, %o0
retl
- smul %o0, %o1, %o0
+ rd %y, %o1
.LLfe2:
.size .mul,.LLfe2-.mul
